You Do Need power plug adapter while traveling from Lesotho to Grenada.

Here is Why You Need An Adapter

The outlet and plug type used in Grenada is G and in Lesotho is M. This is how they look like.

Lesotho

In Lesotho, outlets of type M are in use.

Type M

Grenada

In Grenada, outlets of type G are in use.

Type G