Locking device for a top of a vehicle, - having a locking hook which has a gripping end at the front and a bearing end at the rear, - having a housing, in which the bearing end is mounted so as to be adjustable horizontally in a longitudinal direction of the locking hook, - having a drive device for adjusting the locking hook, - wherein the drive device has at least one two-link mechanism, a drive link drive-connected to the two-link mechanism, and an actuating drive for driving the drive link, - wherein the two-link mechanism has a front link which is mounted on the housing so as to be pivotable at the front about a front vertical pivot axis, - wherein the two-link mechanism has a rear link which is drive-connected at the rear via a coupling device to the bearing end of the locking hook, and is mounted on the coupling device so as to be pivotable about a rear vertical pivot axis, - wherein the two links (9, 12) of the two-link mechanism are mounted on one another between their pivot axes (13, 14) so as to be pivotable about a further vertical pivot axis, and - wherein the drive link is mounted on one of the links so as to be pivotable about a further vertical pivot axis, characterized - in that the drive link is mounted on one of the links, between the pivot axes (14, 16) thereof, about a further vertical pivot axis, - in that the drive device is drive-connected to the bearing end of the locking hook via a coupling device configured as a crosshead, - in that the crosshead has a cross carrier, on which the bearing end of the locking hook is mounted so as to be pivotable about a horizontal pivot axis extending transversely to the longitudinal direction of the locking hook, and the crosshead has a shaft which is mounted on the cross carrier so as to be pivotable about the rear vertical pivot axis, - in that the coupling device is mounted on the housing so as to be adjustable horizontally in the longitudinal direction of the locking hook. - having a locking hook which has a gripping end at the front and a bearing end at the rear, - having a housing, in which the bearing end is mounted so as to be adjustable horizontally in a longitudinal direction of the locking hook, - having a drive device for adjusting the locking hook, - wherein the drive device has at least one two-link mechanism, a drive link drive-connected to the two-link mechanism, and an actuating drive for driving the drive link, - wherein the two-link mechanism has a front link which is mounted on the housing so as to be pivotable at the front about a front vertical pivot axis, - wherein the two-link mechanism has a rear link which is drive-connected at the rear via a coupling device to the bearing end of the locking hook, and is mounted on the coupling device so as to be pivotable about a rear vertical pivot axis, - wherein the two links (9, 12) of the two-link mechanism are mounted on one another between their pivot axes (13, 14) so as to be pivotable about a further vertical pivot axis, and - wherein the drive link is mounted on one of the links so as to be pivotable about a further vertical pivot axis, - in that the drive link is mounted on one of the links, between the pivot axes (14, 16) thereof, about a further vertical pivot axis, - in that the drive device is drive-connected to the bearing end of the locking hook via a coupling device configured as a crosshead, - in that the crosshead has a cross carrier, on which the bearing end of the locking hook is mounted so as to be pivotable about a horizontal pivot axis extending transversely to the longitudinal direction of the locking hook, and the crosshead has a shaft which is mounted on the cross carrier so as to be pivotable about the rear vertical pivot axis, - in that the coupling device is mounted on the housing so as to be adjustable horizontally in the longitudinal direction of the locking hook.