Wren to the Rescue is a fiction novel by Sherwood Smith, which she first wrote in high school in the mid-1960s.
 In that period Smith titled the story Tess's Mess.
 Described are the adventures of the title character, Wren, a female human orphan whose best friend Tess is revealed to be the princess of a neighbouring country.
 When Tess is kidnapped, Wren races to her rescue, making friends with students from a Magic School and learning about her own talents along the way.
 As part of her adventure, Wren is transformed bodily into a dog, and must decide whether to abandon her quest or try to turn her new shape to the advantage, at great risk of losing her human identity in the process.
PEN America: A Journal for Writers and Readers is an annual literary journal that features fiction, poetry, conversation, criticism, and memoir.
 It is published by PEN American Center in New York City.
 Contributors include Yousef Al-Mohaimeed, Paul Auster, Michael Cunningham, Lydia Davis, Petina Gappah, Nikki Giovanni, Rawi Hage, Shahriar Mandanipour, Colum McCann, Michael Ondaatje, Marilynne Robinson, Salman Rushdie, Susan Sontag, John Edgar Wideman, and many others.
Wren & Martin refers to a single book "High School English Grammar and Composition" or collectively, a series of English grammar textbooks written jointly by P. C. Wren and H. Martin.
 Written primarily for the children of British officers residing in India, these books were widely adopted by Indian and Pakistani schools in the post-colonial era and missionary schools in Burma.
 The books were published in 1935, with a discussion on composition added later.
 The content in the books is largely based on "The Manual of English Grammar and Composition" by J. C. Nesfield.
Beau Ideal is a 1931 American pre-Code adventure film directed by Herbert Brenon and released by RKO Radio Pictures.
 The film was based on the adventure novel "Beau Ideal" by P. C. Wren, the third novel in a series of five novels based around the same characters.
 Brenon had directed the first in the series, "Beau Geste", which was a very successful silent film in 1926.
 The screenplay was adapted from Wren's novel by Paul Schofield, who had also written the screenplay for the 1926 "Beau Geste", with contributions from Elizabeth Meehan and Marie Halvey.
Nautical fiction, frequently also naval fiction, sea fiction, naval adventure fiction or maritime fiction, is a genre of literature with a setting on or near the sea, that focuses on the human relationship to the sea and sea voyages and highlights nautical culture in these environments.
 The settings of nautical fiction vary greatly, including merchant ships, liners, naval ships, fishing vessels, life boats, etc., along with sea ports and fishing villages.
 When describing nautical fiction, scholars most frequently refer to novels, novellas, and short stories, sometimes under the name of sea novels or sea stories.
 These works are sometimes adapted for the theatre, film and television.
The Japan Adventure Fiction Association Prizes (日本冒険小説協会大賞 , Nihon Bōken Shōsetsu Kyōkai Taishō ) were presented every year by the Japan Adventure Fiction Association (日本冒険小説協会 , Nihon Bōken Shōsetsu Kyōkai ) (JAFA) from 1982 to 2011.
 They honor the best in adventure fiction published in the previous year.
H. Rider Haggard, KBE ( ; 1856 – 1925) was an English writer, largely of adventure fiction, but also of non-fiction.
 The eighth child of a Norfolk barrister and squire, through family connections he gained employment with Sir Henry Bulwer during the latter's service as lieutenant-governor of Natal, South Africa.
 Rider Haggard travelled to southern Africa in 1875 and remained in the country for six years, during which time he served as Master of the High Court of the Transvaal and an adjutant of the Pretoria Horse.
Percival Christopher Wren (1 November 187522 November 1941) was an English writer, mostly of adventure fiction.
 He is remembered best for "Beau Geste", a much-filmed book of 1924, involving the French Foreign Legion in North Africa.
 This was one of 33 novels and short story collections that he wrote, mostly dealing with colonial soldiering in Africa.
The Hours is a 1998 novel written by Michael Cunningham.
 It won the 1999 Pulitzer Prize for Fiction, the 1999 PEN/Faulkner Award for Fiction, and was later made into an Oscar-winning 2002 movie of the same name starring Nicole Kidman, Meryl Streep and Julianne Moore.
Michael Cunningham (born November 6, 1952) is a U.S. novelist and screenwriter.
 He is best known for his 1998 novel "The Hours", which won the Pulitzer Prize for Fiction and the PEN/Faulkner Award in 1999.
 Cunningham is a senior lecturer of creative writing at Yale University.

Question: Who, Michael Cunningham or P. C. Wren, was an English writer, mostly of adventure fiction?
Answer: Percival Christopher Wren